Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

Methods for evaluating and measuring adhesive bonds in multi-layer anisotropic composite materials are of considerable interest to the aerospace community. Recent quantitative nondestructive evaluation (QNDE) research has concentrated on using obliquely incident ultrasonic waves to determine interfacial degradation in adhesive bonds [1]. For anisotropic materials, this task is more formidable, but the theoretical analysis presented by Balasubramaniam et. al. [2] indicates good prospects for the ultrasonic reflection technique. The primary objective of this experimental investigation was to determine the best QNDE method for measuring the relative thickness of fiberglass/epoxy (Fg/Ep) laminate compared to the adhesive layer bonding a stainless steel pivot in the composite structure of the Hard Upper Torso (HUT). The integrity of the interfacial bonds between the adhesive, the stainless steel pivot, and the composite laminate was also of interest, but of secondary importance to the project.

Volume

14B

Chapter

Chapter 5: Engineered Materials

Section

Bonded Joints

Pages

1529-1536

DOI

10.1007/978-1-4615-1987-4_196

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

QNDE Techniques for Measuring the Dimensions of Adhesive and Fiberglass Bonds Securing the Pivots in the Hard Upper Torso of the Extravehicular Mobility Unit or Spacesuit

Snowmass Village, CO

Methods for evaluating and measuring adhesive bonds in multi-layer anisotropic composite materials are of considerable interest to the aerospace community. Recent quantitative nondestructive evaluation (QNDE) research has concentrated on using obliquely incident ultrasonic waves to determine interfacial degradation in adhesive bonds [1]. For anisotropic materials, this task is more formidable, but the theoretical analysis presented by Balasubramaniam et. al. [2] indicates good prospects for the ultrasonic reflection technique. The primary objective of this experimental investigation was to determine the best QNDE method for measuring the relative thickness of fiberglass/epoxy (Fg/Ep) laminate compared to the adhesive layer bonding a stainless steel pivot in the composite structure of the Hard Upper Torso (HUT). The integrity of the interfacial bonds between the adhesive, the stainless steel pivot, and the composite laminate was also of interest, but of secondary importance to the project.